Here's the beginning of a database of games which weren't released on the Amiga e.g. non-existent ones, falsely advertised ones, existing but unreleased, later released under another name. Additions and corrections welcome!

Here’s my definitive list of previews and never published games taken after a full reading immersion on an Italian magazine called “The Games Machine”, from year 1988 to year 1994.
I guess they are ALL unreleased!

All of these games have at least one or more screenshots, so when (if) you HOL guys are interested in, tell me something, I can scan the pages (remind me resolutions and formats, please!).

anyway I was wondering if anybody knows if the game Nobby the Aardvark by Thalamus was ever released. Im pretty sure it was unreleased as I can't find information about it anywhere except in Amiga Action.

It was a platform game and was featured in the Blue Print section of Amiga Action Issue 36, page 54.

The game looked crap, but I've never played a game with an aardvark as its hero, hehe

page 26-27 the pages are about Arcane and their latest games, in particular Turbo Trax

it makes mention of this game with screenshot and another game The Supreme Warriors (this I
dont think went anywhere though)
The Supreme Warriors, a game designed by Kevin Williams (see text), is slated for development next year by Arcane.
Designed to look very Japanese in style - that is, like a Capcom arcade game -- the design
for warriors looks like a stormer. Remember where you saw this early design map first
(there is a sketch above this text)

Flag
Millenium
was previously in development by gremlin graphics in 92.
set to release spring 93

the game casts you as a mighty wizard, hungry for domination over the planet orm.
its a contest between two villiages, the occupants of which have been turned into mindless zombies and will do whatever their master bids. Basically capture the flag full screen isometric

Just another unreleased title springs to mind.
Ramrod-Gremlin. I think February 1990 Zzap!64/Amiga had preview shots of it alongside Venus the Flytrap,(subsequetly released later on). There were some later shots of Ramrod in Zzap, I just can't recall when,(again in the previews section).

I think a picture of RamRod can be found in the previews section in Zzap! issue 72, April 1991 (the one with Back to the Future 3-setting on the cover).

I also know a screenshot of an RPG called Tennabrae/Tennebrea which appeared in Amiga Format in 1992.
The strangest game I anticipated was Chuckie's World, previewed in CU Amiga in September(?) 1992. This platform game starred Chuckie, a cute hero with a rotund face which starred in many PD-animations. Apart from the preview I've never read anything about it since.
Flair Software announced in 1993 an adventure game called Amazon or something similar starring a female heroin in bikini. It looked like a Monkey Island-beater but it also has disappeared in the mists of time.

Here is a list of games I suspect are unreleased, some I think have been mentioned in other threads, but they do not appear in HOL.

Different Pre Release Names but were released.Death Mask was known as Deathmasque - source The One(may have been a name The One Imposed)Fightin Spirit was known as Perpetual Craze also the company is listed as Dynamic Style - source The One April 94 page 39Brutal Sports Football has a working title of Beast Ball - Source The One April 1993 page 36

Chess Through the Ages - Black Legend - Previewed June 1995 The One page 28
- Cool looking Chess Game, with different background styles
- Initiated April 1993
- set to be released June 1995
- This may have been released and I think its been mentioned before.

Chinto's Revenge - Millenium - Previewed in Amiga Power Issue 4 page 57
- Very Japanese cartoon adv. Guide the unfeasibly large sprite of Chinto into an evil
castle.

Cyberwar - Sales Curve Interactive - Previeed September 1994 Issue of the One page 30
- It was Initiated December 1993
- Set to be released November 1994
- Did it ever happen?

Dark Blade - D.E.X - Previewed in The One January 1994 page 43
- bike racing game
- mentioned in another thread, dont think its in HOL yet though

Discworld - Previwed in the September 1993 Issue of the One page 14
- Doubt much work was done though

Embassy Siege - Gremlin - Previewed in The One January 1994 page 48
- set to be released Winter 1994
- loosley based on the Flag engine (mentioned earlier)

Saurus - Cryo - Previewed in The One January 1994 page 49
- This was cd32 I think

Air Rescue - Thalion - Previewed in The One January 1994 page 49

Evasive Action - Mindscape - Previewed in The One January 1994 page 49
- Set to be released Early 1994 for cd32 and 1200
- This was a 3d game
- mentioned in another thread, but not in HOL

Ferrari Grand Prix Challenge - System 3 - Mentioned in the One October 1993 page16

Front Lines - Impressions - Previewed June 1995 The One page 36
- This was a war game. I think it was Hexagonal.
- Initiated November 1994
- Set to be released July 1995
- developers complained that this was proving difficult to convert across becasue the PC version used Virtual Memory

Kult of Speed - Electronic Arts - Previewed in The One April 1994 Page 32
- Initiated October 1993
- Set to be released June 1994
- racing game

Nascar - Distinctive Software - Previewed in the September 1993 Issue of the One page 15
- Based on the North American sports car championship and co-designed by top driver
- Bill Elliot and the Distinctve Software team, Nascar will attempt to recreate
the thrills and spills of high speed racing action.
Was to be released at 14.99 pounds
- Note: This game may have been released under a new name. I don't think its Bill Elliott's Nascar Challenge

Switchworld - Black Legend - Previewed June 1995 The One Page 26
- This was a first person shooter AGA only. Very simlar to Wolfensten 3d (only better )
- Initiated March 1995
- Set to be released June 1995
- My Amiga Games history from Late 1995 onwards is very sketchy, so this game may have been
released

The Big End - Supervision - Previewed September 1994 The One page 40
- This was a top down (sort of Isometric) racing game.
- This may have been a pre releas name.
- Initiated: September 1993
- Set to be released October 1994

The Gadget Twins - Mirage - Previeed in the October 1992 Issue of the One page 122
- A Flying game (horzontal) Where you hit things with a hammer, cartoon graphics.

Games I believe were released.Creepers - Psygnosis
- I know this game has been mentioned before, But I believe this game was released
because in the Feburary 1993 Issue of the One on Page 24, this game was offered as a competition.

BTW, what would be the best method to upload the scans, via The Zone or via Ftp.

Creepers
I have an issue of Amiga Joker (May 1993 I think) which has a full page review of Psygnosis' Creepers.

Breach 3, Rally & Space Checkers
These games were also previewed in CU Amiga.

Space Academy
The game was featured in a Work In Progress-series which ran in CU Amiga from June 1994 till September 1994 - I think (making it a total of at least 8 pages of information!). I don't know if the series also continued from October 1994 on because I am missing these issues.

And here are some 'new' previews I found in my Amiga magazines pile:

Genesia
An adventure, Monkey Island-style by Flair Software, 1993. The main sprite is a scantilly-clad blonde in a jungle (no, it's not Vixen or Entity). The game was previewed in November 1993.

Survival
A strategic management game by Kompart UK which first would be published on PC and then on Amiga. Also previewed in November 1993.

Miracle Bat
A platform game featuring a sprite resembling very much a hedgehog. This could have been the Amiga mascot! Publisher unknown. Previewed in 1993 in Amiga Joker.

Afterburner-like arcade game
This game by Prestige Software did not have a name. Previewed in Amiga Joker somewhere in 1993 the game looked very much like Afterburner with the camera slightly behind a stealth-fighter which flew over some woods.

Hmm... no.
I have "miracle Bat" under other name (The Bouncy Bat Game), previewed in Amiga Power, Nov92, and a preview of Creepers, from an italian magazine.
But keep on scan, maybe the screenshots are different!